Question

5^x.5^x+2= 625

Answer 1

\(5^x.5^{x+2}=625\)

\(\Leftrightarrow5^{2x+2}=5^4\)

\(\Leftrightarrow2x+2=4\)

\(\Leftrightarrow x=1\)

Vậy ..

Answer 2

5^x.5^x+2 =625

5^x.5^x.5² =625

5^x+x.25 =625

5^2x.25 =625

5^2x =625:25

5^2x =25

5^2x = 5²

⇒2x =2

x =2:2

x =1

Vậy x=1